JPH0541668U - Chip mounting structure for cutting wheel - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a measure capable of effectively suppressing the expansion phenomenon of a dovetail groove in a cassette fitting type chip mounting structure by a simple device. [Structure] A cassette convex portion 5 in which a dovetail 6 having a taper in the longitudinal direction is provided on the periphery of a base metal 1, and a dovetail 6 of the cassette convex portion 5.
In a cutting grindstone to which the chip 4 is detachably attached via a cassette concave portion 7 provided with a dovetail groove 8 having a taper in the longitudinal direction that is removably fitted to the dovetail, , Grooves (recesses) 11 are provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tip mounting structure for a cutting whetstone (blade) used for cutting stone materials, concrete, and the like.

[0002]

[Prior Art]

 A conventional tip mounting structure for this type of cutting wheel is shown in FIG. That is, a segment (grinding stone piece) 4 containing diamond abrasive grains or the like is brazed to a segment 3 that is formed by cutting out slots 2 at equal angular intervals in the peripheral edge of the disk-shaped base metal 1. It is attached via a step (not shown). However, in this mounting structure, since the chip 4 is directly attached to the base metal 1, there is a problem that the chip 4 wears down and it takes time and effort to replace it with a new one.

Therefore, as a remedy for improving the convenience of the tip replacement work and facilitating the reuse of the base metal 1, a detachable cassette fitting type tip mounting structure shown in FIG. 8A is proposed. (German Patent No. 2314977). This mounting structure is such that a cassette convex portion (chip support piece) 5 provided with a dovetail 6 having a taper in the longitudinal direction on the peripheral edge portion 3 of the base metal 1 and a dovetail 6 of the cassette convex portion 5 are detachably fitted. The chip 4 is detachably mounted via a cassette recess (socket) 7 provided with a dovetail groove 8 having a taper in the longitudinal direction. In the illustrated example, the cassette recess 7 is a base metal. The cassette protrusion 5 on which the chip 4 is integrated while being permanently fixed to the first segment 3 is replaced with a new one each time the chip 4 is worn.

However, even when adopting this cassette fitting type chip mounting structure, new technical problems to be solved have been pointed out in the following points.

In the case of the mounting structure shown in FIG. 8A, the dovetail groove 8 of the cassette recess (socket) 7 on the base metal 1 side is wide on the front side and wide on the depth side with respect to the rotation direction R. It is fixed in the direction of narrow width, and the cassette convex portion 5 forming the chip supporting piece is fitted and attached so that the dovetail 6 is inserted from the narrow side. At this time, it is premised that the dovetail groove 8 of the cassette concave portion 7 and the corresponding dovetail 6 of the cassette convex portion 5 ensure a certain machining accuracy in defining the fixing position of both (currently, (In many cases, precision casting products are used.) For example, the cassette protrusion 5 may rattle in the wall thickness direction of the base metal 1 together with the chip 4, the mounting position may change in the longitudinal direction, or the cassette protrusion 5 may lose its ability to be fixed at the next replacement. There are some problems that easily cause trouble.

Regarding the cause of the expanding deformation of the dovetail groove 8, the tangential force acting as a cutting resistance on the chip 4 when the grindstone is used causes the dovetail groove 8 of the cassette recessed portion 7 to move the dovetail 6 of the cassette convex portion 5 to the back. It is considered that this is because it is pushed inward and a large outward outward opening force is applied to the inner surfaces on both sides of the dovetail groove 8 by the wedge action at this time.

Therefore, as a measure to prevent the expansion deformation of the dovetail groove 8, as shown in FIG. 8B, the horizontal guide surfaces 10 and 10 on both sides of the dovetail groove 8 are formed into a roof-shaped inclined surface. 10a and 10a, the horizontal guide surfaces 9 and 9 on both sides of the dovetail 6 are formed on the inclined surfaces 9a and 9a having the corresponding inclination, and the inclined surfaces (10a, 9a) and (10a, 9a) are pressure bonded. An improved proposal for a chip mounting structure has been proposed in which the action is used to restrain the deformation of the dovetail groove 8 (Japanese Utility Model Publication No. 61-6050).

[0008]

[Problems to be solved by the device]

 However, in order to prevent the deformation by the combination of the inclined surfaces, it is doubted how much the deformation preventing ability is enhanced in terms of material mechanics, and originally, the cassette convex portion 5 and the cassette concave portion 7 are In addition to a certain accuracy being imposed on the processing of the dovetail 6 and the dovetail groove 8 having a taper corresponding to the longitudinal direction, in addition to this, the corresponding inclined surface (10a, 9a) is provided with a stricter machining accuracy. If demands are overlapped, it is undeniable that the application will be substantially limited in terms of processing technology and cost.

In view of the above technical problems, the present invention provides a method for effectively suppressing the expansion phenomenon of a dovetail groove in a cassette fitting type chip mounting structure with a simpler device as follows. Is proposed to.

[0010]

[Means for Solving the Problems]

 The present invention is, as a means for achieving the above object, a cassette convex portion provided with a dovetail having a taper in a longitudinal direction on a peripheral edge of a base metal, and the cassette convex portion is detachably fitted to the cassette convex portion. In a cutting grindstone for removably mounting a chip through a cassette recess having a dovetail groove having a taper in the longitudinal direction, a groove or a recess is provided on both guide surfaces of the dovetail or both guide surfaces of the dovetail groove. ..

[0011]

[Action]

 If a groove or a recess is provided on both guide surfaces of the dovetail or the dovetail, the dope groove can be prevented from expanding and deforming by the following action.

When the cutting whetstone is used, the cutting tangential force acts on the tip as described above, and the outward opening force is applied to the inner side surfaces of both sides of the dovetail groove by the wedge action. As the vertical component of the force, a vertical pressing force that presses the guide surfaces on both sides of the dovetail and the dovetail groove against each other is generated. At this time, if at least one guide surface is provided with a recess such as a groove or a depression, the guide surface on the other side will microscopically deform into the recess due to the pressing force, and it will bite into this recess. Thus, the guide surfaces are engaged with each other in the horizontal direction, and an effect of suppressing mutual slippage, that is, a deformation in which the dovetail groove expands laterally is exhibited.

[0013]

【Example】

 1 to 4 show an embodiment of a cutting wheel according to the present invention.

First, referring to FIG. 4, a schematic structure of the whole grindstone (blade) will be described. In the figure, reference numeral 1 is a disc-shaped base metal made of alloy steel, and a peripheral portion of the base metal 1 is The slots 2 are cut out to form a large number of segments 3 that are equiangularly divided, and a chip 4 containing diamond abrasive grains or the like is attached to each segment 3 via a set of cassettes 5 and 7. Has been.

The details of the mounting structure of the chip 4 mounted on each segment 3 of the base metal 1 are shown in FIG. In the case of this embodiment, the cassette convex portion 5 provided with the dovetail 6 having a taper in the longitudinal direction is fixed to the base metal 1 side by means such as brazing (not shown), while the cassette convex portion 5 is formed. The cassette recess 7 provided with a dovetail groove 8 having a taper in the longitudinal direction that is removably fitted in the dovetail 6 of the dovetail is prepared as a separate piece detachable from the base metal 1 and is provided on the upper surface of the cassette recess 7. The chip 4 is fixed with a predetermined thickness via means such as brazing (not shown).

Here, in the dovetail 6 of the cassette convex portion 5 fixed to the base metal 1 side, the dovetail width is narrower on the front side and wider on the depth side with respect to the rotation direction R in the longitudinal direction. On the other hand, the taper is formed, and on the other hand, the dovetail groove 8 of the cassette recess 7 forming the chip support piece is formed with a taper in the longitudinal direction in such a direction that the groove width on the insertion side of the dovetail 6 is wide and the opposite side is narrow. In the state in which the dovetail groove 8 is fitted into the dovetail 6 shown in FIG. 2, both are forcibly fitted at appropriate positions in the longitudinal direction and are fixed so that they cannot be removed.

Therefore, in the mounting structure according to the present invention, the guide surfaces 9 and 9 are formed on both sides of the dovetail 6 of the cassette convex portion 5, and correspondingly, are formed on both sides of the dovetail groove 8 of the cassette concave portion 7. The guide surfaces 10 and 10 are formed on a horizontal plane as in the conventional example shown in FIG. 8A, and longitudinal grooves 11 and 11 along the dovetail 6 are formed on the surface of the former. It is provided in a pair on the left and right.

In the case where the grooves 11 and 11 are provided on the guide surfaces 9 and 9 on both sides of the dovetail 6 of the cassette convex portion 5, the structure of the dovetail itself is very simple and the processing is simple, but the dovetail groove 8 expands. It can be a very effective means of prevention. The reason is as follows.

When the cutting grindstone is used, a cutting tangential force acts on the tip 4 as indicated by an arrow T in FIG. 2, and the wedge force acts as a horizontal component force of the wedge force applied from the dovetail 6 to the dovetail groove 8 by the wedge action. The outward opening force Fh is applied to the inner side surfaces of both sides of the dovetail groove 8 so that the dovetail groove 8 tries to spread to both sides as shown by the chain double-dashed line in FIG. However, at this time, at the same time, as the vertical component force of the wedge force of the ant 6 against the dovetail 8, the guide surfaces (9, 9), (10, 10) on both sides of the ant 6 and the dovetail 8 are pressed against each other. If the guide surfaces 9, 10 are provided with the grooves 11, 11 by the pressing force Fv in the direction, the guide surfaces 10, 10 on the other side are pressed by the pressing force Fv, and as shown in FIG. Material deformation (biting portion 10A) that bites into the groove 11 is caused, and the biting into the groove 11 causes the guide surfaces (9, 9) and (10, 10) to engage with each other in the horizontal direction, increasing the deformation resistance, The mutual slippage, that is, the effect of suppressing the deformation in which the dovetail groove 8 tries to spread to the side is exhibited.

Further, as another useful point of providing the grooves 11, 11 on both guide surfaces 9, 9 of the dovetail 6 of the cassette convex portion 5, when the blade is used, the grooves 11, 11 are used for removing grinding water and chips. The action and effect of working as an escape area can be provided.

In the embodiment, the cross-sectional shape of the grooves 11, 11 has a rectangular cross-section, but the cross-sectional shape, groove depth, etc. may be appropriately considered in consideration of the deformation suppressing effect, processing convenience, and the like. Get changed. Further, a plurality of grooves 11 provided on the guide surface can be engraved, and an appropriate inclination can be provided in the direction of the groove 11.

5 and 6 show another embodiment of the present invention. FIG. 5 illustrates an example in which recesses 12 and 12 are provided at regular intervals in place of the grooves 11 and 11 on the surface of the guide surfaces 9 and 9, and FIG. It is illustrated. Even if these recesses 12 and 13 are provided on the guide surfaces 9 and 9 instead of the groove 11, the same effects as those of the above-described embodiment are obtained in terms of the effect of suppressing the expansion deformation of the dovetail groove 8 and the effect of releasing chips and the like. Is expected to be obtained.

In the above embodiment, the case where all the concave portions 11, 12, 13 are provided on the guide surfaces 9, 9 on the cassette convex portion 5 side having the dovetail 6 is illustrated, but in principle, the dovetail groove 8 is provided. The same effect can be obtained by providing the guide surfaces 10 and 10 on the side of the cassette recess 7 having the above, and it is also possible to provide the guide surfaces 10 and 10 on both sides.

Further, in all the embodiments shown in the drawings, a chip supporting piece in which the cassette convex portion 5 having the dovetail 6 is fixed to the base metal 1 side, and the cassette concave portion 7 having the dovetail groove 8 is detachable from the base metal 1 However, as in the case of the conventional example shown in FIG. 8, the situation is essentially the same when the cassette recess 7 is attached to the socket and the cassette protrusion 5 is mounted as the chip support piece. Of course, it is also free to take such an embodiment.

[0025]

[Effect of the device]

 As described above, by adopting the improved tip mounting structure according to the present invention, it is possible to effectively suppress the problem of the expansion and deformation of the dovetail groove, which has been raised in the cassette mounting type tip mounting structure. It is possible to provide a simple and effective solution that can be achieved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a cassette having a chip mounting structure showing an embodiment.

FIG. 2 is a perspective view showing a state where the chip of FIG. 1 is attached.

FIG. 3 is an enlarged cross-sectional view of the main parts of FIG. 2 showing the operation.

FIG. 4 is a perspective view showing an outline of a cutting grindstone according to an embodiment.

FIG. 5 is a perspective view of a cassette protrusion according to another embodiment.

FIG. 6 is a perspective view of a cassette protrusion according to another embodiment.

FIG. 7 is a half front view showing a conventional example of a cutting grindstone.

FIG. 8 is an exploded perspective view of a cassette showing a conventional example of a chip mounting structure, (A) showing a conventional example and (B) showing an improved conventional example thereof.

[Explanation of symbols]

 1 base metal 2 slot 3 segment 4 chip 5 cassette convex portion 6 dovetail 7 cassette concave portion 8 dovetail groove 9 guide surface 10 guide surface 10A biting portion 11 groove 12 dent 13 rough surface

Claims (1)

[Scope of utility model registration request] 1. A cassette convex portion provided with a dovetail having a taper in the longitudinal direction, and a dovetail groove having a taper in the longitudinal direction which is removably fitted into the dovetail of the cassette convex portion are provided on the periphery of the base metal. In a cutting grindstone for removably mounting a chip through a cassette recess, a chip mounting structure for a cutting grindstone, characterized in that grooves or depressions are provided on both side guide surfaces of the dovetail or both side guide surfaces of the dovetail groove. ..